Shadow mask support member having high strength and thermal defo

Details Shadow mask support member having high strength and thermal defo Shadow mask support member having high strength and thermal defo

1994-08-18

1996-03-26

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313405, H01J 2907

Patent

active

055023509

ABSTRACT:
There is disclosed a shadow mask support member for supporting a shadow mask of a Braun tube which member comprises a parallel bonded-type bimetal, and has a high strength and an excellent resistance to thermal resistance. There is also disclosed a method of producing such a support member. The shadow mask support member includes a high-strength, low-expansion alloy plate, and a high-expansion alloy plate which are bonded together on their marginal surfaces, the low-expansion alloy plate having an excellent resistance to thermal deformation, the low-expansion alloy plate consisting essentially, by weight, of 0.1-0.5% C, not more than 1.0% Si, not more than 2.0% Mn, 30-40% Ni, 1.0-5.0% Mo and the balance Fe and incidental impurities, the low-expansion alloy plate having an average thermal expansion coefficient of not more than 6 .times.10.sup.-6 /.degree. C. at 30.degree.-100.degree. C. and a tensile strength of not less than 100 kgf/mm.sup.2 at a room temperature, and the high-expansion alloy plate having an average thermal expansion coefficient of not less than 14.times.10.sup.-6 /.degree. C. at 30.degree.-100.degree. C. and a tensile strength of not less than 110 kgf/mm.sup.2 at a room temperature. Optionally, the low-expansion alloy plate may further contain not more than 10.0% Cr and not more than 10.0% Co, and the content of (Ni+Co) is 30-40%.

REFERENCES:
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patent: 4315189 (1982-02-01), Goto et al.
patent: 4613785 (1986-09-01), Ragland
patent: 4792719 (1988-12-01), Ornstein
patent: 5066886 (1991-11-01), Harner
patent: 5394052 (1995-02-01), Oh

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